Question about RCA 36V430T 36" TV

1 Answer

Dead set, HOT transistor keeps shorting

Hi i have a 36" RCA crt with itc008 board that got damaged by lightning hitting near the power line. Upon inspection, you hear a loud squealing by the primary transistor.

After further inspection, i found that the horizontal output transistor was shorted. I replaced that HOT and it shorted again immediately.

with the HOT out: the set cycles, with it in: the set appears completely dead. Could these be caused by a high reg b+ voltage?? Any ideas at all, please help.

Posted by on

  • 5 more comments 
  • R E Dec 21, 2008

    is the yoke the circuit coming out of the tube or the glass part?

  • R E Dec 21, 2008

    reg B+ is near 250V, will replace ip050. do u know wheres the best place to get this part online? thanks for your help

  • R E Dec 21, 2008

    thanks but mouserelectronics.com is way cheaper

  • R E Dec 21, 2008

    thanks but mouserelectronics.com is way cheaper

  • R E Feb 11, 2009

    replaced all actice components on power supply. reconnected everything and got 130V at collector of HOT, can hear the static on the crt but not starting up, then HOT shorted again :(

    any ideas, i know its not power supply, now it has to be yoke circuit, e/w correction block or horizontal circuits, thank you

  • R E Feb 11, 2009
  • William Rayburn
    William Rayburn May 11, 2010

    If it was hit the surge could have damaged the yoke which is bonded and not worth the repair... Check your B+ on the collector of the hot - if higher than 130v it's either the yoke or regulator Ip050 p/n 231525....

    Bill

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 934 Answers

It's the copper coiled magnet on the neck of the crt closest to the front of the tube.

Posted on Dec 21, 2008

  • 1 more comment 
  • William Rayburn
    William Rayburn Dec 21, 2008

    Try Vance Baldwin http://www.encompassparts.com/ just sign in as a guest...

  • William Rayburn
    William Rayburn Dec 21, 2008

    Mouser is okay also - some times they don't always have the more specific parts on-hand, but if you found one there that's great...

  • William Rayburn
    William Rayburn Feb 11, 2009

    Did you also replace the Horizontal Damper Diode, DL021, P/N 242907 ? I'd suspect that if the damper was okay you might have a bad Ihvt, LL005, P/N 262343 and you could possibly use an ASTI or HR Diemen replacement for something less expensive.

    Then again, could be the yoke. The way you could test that theory is unplug the yoke at the main board and after replacing the HOT again fire it up and see if it blows the transistor again. If it does it's not the yoke...

    BTW: you might consider using a 2sd1881 for a HOT they're a little less expensive than OEM...

    Bill

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Power light flashes, tv will not come on


If the power light flashes, it is an indication of shorted component/s on the main board circuit. most probably it will be with its Horizontal Output section. Horizontal output transformer, Horizontal Output transistor etc: Your set need a detailed check up.

Jun 20, 2012 | RCA F36650 36" TV

1 Answer

The tv is a 32"


Hello
The horizontal output transistor of your RCA TV has shorted. Horizontal output transistor is one, that drive the Line Output Transformer [LOT] in short, which gives voltages requred to the picture tube of your tV. There are mainly two resons for this transistor shortage. If the above said LOT has shorted [a winding short in between at its inner side; and is irreparable]; and for some other reasons which cannot be predicted. First replace this transistor, which can be located very near to the LOT and will be screwed onto a metal heatsink to radiate heat away from it while working.
It will be three terminal black component. Replace it with same type and number, and switch ON your tV for a short time, say 4 seconds or so; unplug the device from AC mains wall socket, touch the replaced component with bare fingers and feel the heat. It may be slight warm, bu not too hot. If LOT has damaged, this transistor also will heat up, and a whisiling sound will be there. If so; never switch it ON again; replace the LOT and it is damaged. OK.

May 28, 2011 | RCA TruFlat 27F520T 27" TV

1 Answer

RCA MOD# 20-f-514-TD Chassis#ATC-116 SER#1054e6j09 c231 Will not power-on. There is a led red light blinks and makes a audio noise every time the light blinks


Hello

Either your RCA tvs LOT [Line Output Transformer] or its drive transistor [horizontal output transistor is faulty. First replace the Horizontal Output Transistor. It can be located very near to the LOT said above, be screwed onto a metal heat sink to radiate heat away from it while it works. It is a three terminal device, black in colour. Unscrew and desolder it out of the printed circuit board and check whether it has caloctor to emitter or collector to base leak . If it found leaky there is a possiblity of LOT damage. Anyway replace the said transitor first. After replacing, switch on the set for a short period of time, say 3 or 4 seconds only, unplug it from the power socket, and feel the heat effect of the replaced transistor. It may get warm, but not too hot. If it heats up abnormally, surely the LOT said about is faulty, and should be replaced with same type and number.
When selecting LOT, insist on orginal replacement, as substitutions will detereate the picture quality and its life time. If you wants further assistance, feel free to get me through Fixya. OK.

Dec 30, 2010 | RCA Televison & Video

1 Answer

This morning I tried to turn my RCA TV (model 24R411T) on and nothing happened. I tried plugging it into a different outlet, still nothing. I tried leaving it unplugged about 10 minutes and trying again,...


Hello,

Power surges or nearby lightning strikes can destroy electronic equipment. However, most of the time, damage is minimal or at least easily repaired. With a direct hit, you may not recognize what is left of it!

Ideally, electronic equipment should be unplugged (both AC line and phone line!) during electrical storms if possible. Modern TVs, VCRs, microwave ovens, and even stereo equipment is particularly susceptible to lightning and surge damage because some parts of the circuitry are always alive and therefore have a connection to the AC line. Telephones, modems, and faxes are directly connected to the phone lines. Better designs include filtering and surge suppression components built in. With a near-miss, the only thing that may happen is for the internal fuse to blow or for the microcontroller to go bonkers and just require power cycling. There is no possible protection against a direct strike. However, devices with power switches that totally break the line connection are more robust since it takes much more voltage to jump the gap in the switch than to fry electronic parts. Monitors and TVs may also have their CRTs magnetized due to the electromagnetic fields associated with a lightning strike - similar but on a smaller scale to the EMP of a nuclear detonation.

Was the TV operating or on standby at the time? If it was switched off using an actual power switch (not a logic pushbutton or the remote control), then either a component in front of the switch has blown, the surge was enough to jump the gap between the switch contacts, or it was just a coincidence (yeh, right).

If the TV was operating or on standby or has no actual power switch, then a number of parts could be fried.

TVs usually have their own internal surge protection devices like MOVs (Metal Oxide Varistors) after the fuse. So it is possible that all that is wrong is that the line fuse has blown. Remove the cover (unplug it first!) and start at the line cord. If you find a blown fuse, remove it and measure across the in-board side of fuse holder and the other (should be the neutral) side of the line. The ohmmeter reading should be fairly high - well certainly not less than 100 ohms - in at least one direction. You may need to unplug the degaussing coil to get a reasonable reading as its resistance may be 25 or 30 ohms. If the reading is really low, there are other problems. If the resistance checks out, replace the fuse and try powering the TV. There will be 3 possibilities:

It will work fine, problem solved.

It will immediately blow the fuse. This means there is at least one component shorted - possibilities include an MOV, line rectifiers, main filter cap, regulator transistor, horizontal output transistor, etc. You will need to check with your ohmmeter for shorted semiconductors. Remove any that are suspect and see of the fuse now survives (use the series light bulb to cut your losses - see the section.

It will not work properly or appear dead. This could mean there are open fusable resistors other defective parts in the power supply or elsewhere. In this case further testing will be required and at some point you may need the schematic.

Jun 14, 2010 | RCA 27R411T 27" TV

1 Answer

Tv will not power on. Hear a high pitched sound


the horizonal output transistor is shorted-replace it also resolder coil near transistor-if output shorts again flyback transformer is bad

Sep 15, 2009 | RCA F36673ET 36" TV

2 Answers

My 36' RCA TV JUST QUIT WORKING. TURNED ON POWER


A shorted horizontal output transistor or shorted flyback. If the flyback is shorted replace also its HOT.

Apr 05, 2009 | RCA F36650 36" TV

1 Answer

Sony WEGA Trinitron KV-36FV15 does not come on after lightning


Look for two integrated circuits marked MCZ3001D. These are 16 pin rectangular black plastic "chips". They are static and surge sensitive devices and are a "common" culprit for failure in this chassis. One or both may have failed. Also, if you can, near both of them is a ceramic cased resistor marked 0.1 ohm. If either one of these is open, then the two mosfet regulators (mounted on little individual heat sinks) marked C4834 on the parts are shorted and need to be replaced as well. (There are 4 of these in total in this set, one pair for each MCZ3001D SMPS driver...check all 4 for shorts. If your ohmeter reads zero between any of the pins, then its bad)

Mar 20, 2009 | Sony KV-36FV16 36" TV

1 Answer

RCA F36665 36" red picture


Do picture have little white lines in it? This could be caused by a bad CRT driver transistor. On the small CRT board on back of tube. The red could be shorted

Dec 07, 2007 | RCA F36665 36" TV

1 Answer

Tv does not turn on.


There is probably a short or a near short loading the power supply circuit, a leaky capacitor, shorting diode, transistor,IC,LOPT etc. Have the set checked by a technician near you.

It is still worth repairing!

imikendumuimui@yahoo.co.uk

Dec 06, 2007 | Televison & Video

1 Answer

Lightning Strike, Plz Help!


Hi. The red line on ICS is quite normal it does not mean the part has failed. To be honest in most cases if a tv has been hit by strike it is a right off & scapped. What I suggest is to remove the main pcb & power supply pcb if its seperate & inspect the print side of pcb for signs of arcing tracking or burnt track. Repair any damaged track by cleaning off the coating to get at clean copper then solder wire accros to bridge the damage. Check the power supply resistors diodes transistors look carefully for any burnt components or components which are physicaly damaged. Check the line output transistor this will be near the large transformer with a thick red ht lead going up to the crt. Check all the components you can in the line stage look at all the ICS to ensure none of them have holes in them or have blown apart. Hopefully you find some or one if your very lucky that is damaged replace it & try your tv.

Sep 23, 2007 | Toshiba CZ36V61 TV

Not finding what you are looking for?
RCA 36V430T 36" TV Logo

Related Topics:

483 people viewed this question

Ask a Question

Usually answered in minutes!

Top RCA Televison & Video Experts

The Knight
The Knight

Level 3 Expert

72670 Answers

matt martin
matt martin

Level 3 Expert

1207 Answers

Jaime Hernandez

Level 3 Expert

2296 Answers

Are you a RCA Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...